We have seen some big moves towards a working quantum computer. Microsoft has predicted that Quantum computers would be available in 10 years. According to some experts, quantum computer can calculate private key for a Bitcoin address in a minute.

So, what can be done to save Bitcoin from it?

One way could be to introduce larger Private keys. But how would they be assigned to people who are currently using it?

And please don't comment that 'you are thinking about this too early.'